Corrugated sheet with means accommodating dimension variation



L. LE BRUN March 28, 1967 CORRUGATED SHEET WITH MEANS ACCOMMCDATINGDIMENSION VARIATION Filed March 4, 1965 United States Patent 3,310,925CORRUGATED SHEET WITH MEANS ACCOMMO- DATING DIMENSION VARIATION Leon LeBrun, Montreal, Quebec, Canada, assignor to Montreal Roofing Mfg. Co.Ltd., Montreal, Quebec, Canada Filed Mar. 4, 1965, Ser. No. 437,080Claims priority, application Canada, Sept. 12, 1964, 911,568, Patent709,124 1 Claim. (Cl. 52573) The present invention relates toimprovements in roofing or siding sheets.

It is a main object of the invention to provide a roofing or sidingsheet having a particular configuration capable of providing exceptionalfeatures not found in known roofing or siding sheets of this type. Moreparticularly, the roofing or siding sheets of the invention are sodesigned as to provide complete water-tightness at the joints thereofwhile having a durable, solid and economical feature.

The above noted objects and features can be found in a roofing or sidingsheet made according to the invention and comprising a body of sheetmetal formed with a pair of sidelapping ribs extending along twoparallel side edges of the body; a plurality of further ribs betweensaid pair of ribs, spaced therefrom and from one another, a plurality ofexpansion and contraction crimps formed between said pair of ribs andthe further ribs and between the further ribs, and cross-ribs betweenthe pairs of sidelapping ribs and the further ribs and also between thefurther ribs; the cross-ribs being formed at one end of said body.

A better understanding of the invention will be afforded by thefollowing description having reference to the appended drawing, wherein:

FIG. 1 is a shortened perspective view of a roofing or siding sheet madeaccording to the invention;

FIG. 2 is a cross-sectional view, on an enlarged scale, of twointerconnected sheets made according to the invention;

FIG. 3 is a perspective view intended to illustrate the joining ofseveral adjacent sheets, all made in accordance with the teaching of theinvention.

In order to obtain the notable above-mentioned features of tightness,durability and sturdiness, the roofing or siding sheet, which isgenerally flat and rectangular, is formed of sheet metal with a pair ofsidelapping ribs 1 extending along two parallel side edges of the bodyof the sheet and adapted, as its name implies, to be overlapped withsidelapping ribs of an adjacent sheet as shown in FIGS. 2 and 3.

Between said pair of ribs, a plurality of secondary ribs 3 are providedwhich are spaced from one another and also spaced from the sidelappingribs.

3,310,925 Patented Mar. 28, 1967 Ice Between the sidelapping ribs 1 andsecondary ribs 3 as well as between the secondary ribs 3, there isprovided a plurality of expansion and contraction crimps 5, bestidentified in FIG. 3.

Finally, cross-ribs 7 are formed between the sidelapping ribs 1 and thesecondary ribs 3 as well as between the central secondary ribs; the saidcross-ribs 7 being formed at one end of the body of the sheet.

Preferably and in order to obtain full advantages of the above-namedfeature, the sidelapping and intermediate secondary ribs 1 and 3 arearcuate in cross-section, the crimps 5 are trapezoidal in transversecross-section while the cross-ribs 7 are triangular in transversecross-section also. It will be noted that all of these ribs and crimpsproject from a single side of the body of the sheet.

It has been found in practice that a sheet formed with the above notedconstructional features possesses outstanding qualities of watertightness, durability and sturdiness.

I claim:

A roofing or siding sheet comprising a body of sheet metal formed with apair of arcuate sidelapping ribs extending fully alongeach of twoparallel side edges of said body; two spaced intermediate arcuate ribsbetween said pairs of ribs, extending the full length of said body; aplurality of contiguous trapezoidal extension and contraction crimpsextending the full length of said body parallel to and between, on theone hand, said sidelapping ribs and said intermediate ribs and, on theother hand, between said intermediate ribs, and stiifening cross ribsformed between said sidelapping and intermediate ribs and between saidintermediate ribs, said stiffening cross ribs intersecting and extendingover said crimps, the said cross ribs being triangular in cross-sectionand projecting on the same side of the sheet as the sidelapping and theintermediate ribs.

References Cited by the Examiner UNITED STATES PATENTS 502,552 8/1893Detombay 52537 X 1,329,794 2/1920 Moomaw 52537 X 2,191,383 2/1940Haswell 52630 3,041,784 7/1962 Facer et al 52--537 X 3,059,733 10/1962Hermann 52-537 X 3,059,734 10/1962 Tripp 5253-7 X 3,118,523 1/1964 Girot52573 3,184,263 5/1965 Plegat 52630 X OTHER REFERENCES ENR EquipmentNews, October 7, 1937, page 35.

FRANK L. ABBOTT, Primary Examiner.

M. O. WARNECKE, Assistant Examiner.

